It is highly unlikely that the woodhead tunnels will ever be used again for car or train use.
I have worked in them twice in the past refurbishing them and 1 is full of service cables and both have major restrictions in them due to collapses and relining.
To remove the above and make big enough for modern rail or dual carriageway wouldn’t cost much less than building a new one.
I also did some design / feasibility work on the Tintwsitle bypass tunnel years ago, so I’m guessing this is being resurrected?
I also started working on the Stone Henge tunnel option last year ;)
Not seen any announcements, but another good one I did some feasibility on was a tunnel at Tarbet to cut out that narrow, twisty bit along the north of Loch Lomand.